We request 9 days on TOSCA to study the interaction of adsorbed SO2 and NO2 gas molecules with a porous aluminium-based metal-organic framework (MOF) as a function of gas loading. The proposed study will enable the investigation of the interactions formed by the gas molecules not only through the INS scattering from the gas molecules (particularly for NO2) but also the change in the INS spectra due to the effect of the interactions with the gas molecules on the framework. This MOF material exhibits extremely high selectivity for CO2, SO2 and SO2 at ambient conditions, with high uptake capacities and an unusual positive heat of adsorption for SO2, which is a strong indication of the presence of chemisorption linked with specific guest/host interactions.